Six Phases of the Moon
Galileo. Six Phases of the Moon. 1616. ARTstor. Web. 8 Dec. 2009.
<http://library.artstor.org/library/ #3|search|1|Galileo27s20Astronomy
|Multiple20Collection20Search|||type3D3126kw3DGalileo27s20Astronomy
26id3Dall26name3D>
During the Renaissance, Nicolaus
Copernicus proposed a heliocentric model of the solar system. His work
defended, expanded upon, and corrected Galileo Galilei and Johannes Kepler.
Galileo innovated by using telescopes to enhance his observations. Further
discoveries paralleled the improvements in the size and quality of the
telescope. More extensive stars catalogues were produced by Lacaille. The
astronomer Willian Herschel made a detailed catalog of nebulosity and
clusters, and in 1781 discovered the planet Uranus, the first new planet
found. The distance to a star was first announced in 1838 when the parallax
of 61 Cygni was measured by Fridrich Bessel.
System of Ptolemy
System of Ptolemy. N.d. ARTstor. Web. 8 Dec. 2009. <http://whyfiles.org/
294astro_year/images/1ptolemaic_system.jpg>.
The first part of the Geographia is a discussion of the data and of the methods he used. As with
the model of the solar system in the Almagest, Ptolemy put all this
information into a grand scheme. Following Marinos, he assigned coordinates
to all the places and geographic features he knew, in a grid that spanned
the globe. Latitude was measured from the equator, as it is today, but
Ptolemy preferred in book 8 to express it as the length of the longest day
rather than degrees of arc (the length of the midsummer day increases from
12h to 24h as one goes from the equator to the polar circle). In books 2
through 7, he used degrees and put the meridian of 0 longitude at the most
western land he knew, the "Blessed Islands", probably the Cape
Verde islands (not the Canary Islands, as long accepted) as suggested by
the location of the six dots labelled the "FORTUNATA" islands
near the left extreme of the blue sea of Ptolemy's map here reproduced.
Galileo. Six Phases of the Moon. 1616. ARTstor. Web. 8 Dec. 2009.
<http://library.artstor.org/library/ #3|search|1|Galileo27s20Astronomy
|Multiple20Collection20Search|||type3D3126kw3DGalileo27s20Astronomy
26id3Dall26name3D>
During the Renaissance, Nicolaus
Copernicus proposed a heliocentric model of the solar system. His work
defended, expanded upon, and corrected Galileo Galilei and Johannes Kepler.
Galileo innovated by using telescopes to enhance his observations. Further
discoveries paralleled the improvements in the size and quality of the
telescope. More extensive stars catalogues were produced by Lacaille. The
astronomer Willian Herschel made a detailed catalog of nebulosity and
clusters, and in 1781 discovered the planet Uranus, the first new planet
found. The distance to a star was first announced in 1838 when the parallax
of 61 Cygni was measured by Fridrich Bessel.
System of Ptolemy. N.d. ARTstor. Web. 8 Dec. 2009. <http://whyfiles.org/
294astro_year/images/1ptolemaic_system.jpg>.
The first part of the Geographia is a discussion of the data and of the methods he used. As with
the model of the solar system in the Almagest, Ptolemy put all this
information into a grand scheme. Following Marinos, he assigned coordinates
to all the places and geographic features he knew, in a grid that spanned
the globe. Latitude was measured from the equator, as it is today, but
Ptolemy preferred in book 8 to express it as the length of the longest day
rather than degrees of arc (the length of the midsummer day increases from
12h to 24h as one goes from the equator to the polar circle). In books 2
through 7, he used degrees and put the meridian of 0 longitude at the most
western land he knew, the "Blessed Islands", probably the Cape
Verde islands (not the Canary Islands, as long accepted) as suggested by
the location of the six dots labelled the "FORTUNATA" islands
near the left extreme of the blue sea of Ptolemy's map here reproduced.